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Data Analysis

MassCalc · Formula & MS Toolkit icon
MassCalc · Formula & MS Toolkit
Monoisotopic and average mass, natural isotope distributions, MF finder from m/z, peptide / oligonucleotide fragment tables, amino acid composition average m/z and polymer oligomer lists — all computed locally in the browser
ProteinCut · Peptide Digest Masses icon
ProteinCut · Peptide Digest Masses
Theoretical mass of every peptide from an in-silico protein digest, with cleavage rules identical to ExPASy PeptideMass — 25 enzymes/reagents, cysteine alkylation, methionine oxidation, 0-5 missed cleavages, seven ion forms up to 5+ charge, monoisotopic / average masses, plus intact protein mass and isoelectric point (Bjellqvist), computed locally in the browser
PepFragCalc · Peptide Fragment m/z icon
PepFragCalc · Peptide Fragment m/z
Theoretical a/b/c and x/y/z fragment ion m/z tables at 1+ to 3+ with -NH3 / -H2O secondary ions — global modification rules applied once and multi-line batch input with a table per peptide, computed locally in the browser
GRAVYCalc · Protein Hydropathy icon
GRAVYCalc · Protein Hydropathy
Batch GRAVY (grand average of hydropathy) for multi-FASTA protein sequences on the Kyte-Doolittle scale — gzip file import, ignore chars, custom separator and decimal sign, computed locally in the browser
GlycoCalc · Glycan Mass Calculator icon
GlycoCalc · Glycan Mass Calculator
Monoisotopic / average mass and elemental composition of glycans and glycopeptides: underivatized, permethylated, 2-AA and 2-AB labelled forms plus 52 ESI adduct m/z values — modelled on the NIST Glyco Mass Calculator, computed locally in the browser
SDS-PAGE-Calc · Gel Recipe Calculator icon
SDS-PAGE-Calc · Gel Recipe Calculator
Polyacrylamide gel recipes for SDS-PAGE: enter the gel count and the separating / stacking percentages and get ddH2O, 30% or 40% acrylamide stock, 1.5 M Tris pH 8.8 and 0.5 M Tris pH 6.8, 10% SDS, 10% APS and TEMED in ml and µl, plus a copyable six-step protocol — modelled on cytographica.com/lab/acryl2.html, computed locally in the browser
MDCalc icon
MDCalc
Medical formula calculator library
PubChem icon
PubChem
NIH database of chemical substances & bioactivity
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Online Tools

Chinese Converter icon
Chinese Converter
Simplified ⇄ Traditional using Wikipedia tables, with Taiwan / Hong Kong / Mainland wording
Car Insurance Calculator icon
Car Insurance Calculator
Estimate auto insurance premiums for 9 coverage lines — compulsory traffic liability, third-party liability, vehicle damage, theft, fire, glass, occupant liability, scratch and the deductible waiver — on the standard industry rate table, instantly and entirely in your browser
Litigation Fee Calculator icon
Litigation Fee Calculator
Court filing fees per China's Measures on Payment of Litigation Fees: tiered quick formulas for property and other cases, plus execution application fees, preservation fees, payment orders, public summons and setting-aside applications, with a rate lookup table
Text Diff & Review icon
Text Diff & Review
Compare two texts side by side; accept or reject each change and export the merged result
PDF Toolkit icon
PDF Toolkit
Merge, split, organise, convert, watermark and protect PDFs — eight tools on one page, processed locally in your browser
ImgCompress · Image Compressor icon
ImgCompress · Image Compressor
TinyPNG-style image compression: lossy PNG quantization (≤256 colors with dithering, lossless when colors fit), JPEG re-encoding and WebP conversion with before/after compare and batch ZIP download — everything stays in your browser
ImgConvert · Image Format Converter icon
ImgConvert · Image Format Converter
Convert between PNG / JPEG / WEBP / BMP / GIF / SVG / AVIF / TIFF / ICO / APNG: batch up to 50 images (select several or drop a folder, results as one ZIP), quality slider, fill colour for transparent areas, rotate/flip and resize, grayscale / B&W / sepia colour modes and text watermarks — every conversion happens locally in your browser
TextToSpeech · Text to Speech icon
TextToSpeech · Text to Speech
Read text aloud in the browser: paste up to 2,500 characters, pick a language and voice your browser and OS actually provide, tune rate, pitch and volume, long text is chunked automatically with pause / resume / stop — modelled on crikk.com/text-to-speech, synthesis runs on your device
SpeechToText · Browser Dictation icon
SpeechToText · Browser Dictation
Voice typing in the browser: press Start and speak — text appears at the caret in real time, say "period", "comma" or "new line" to insert punctuation, with continuous dictation, auto-save and txt / Word export. Modelled on speechnotes.co; recognition runs inside your browser and audio is never uploaded
IP Location Lookup icon
IP Location Lookup
Geolocation, ISP & ASN for any IPv4/IPv6 address; shows your own IP on open
Perpetual Calendar icon
Perpetual Calendar
Gregorian–lunar month-by-month calendar with the 24 solar terms, holidays and workday flags, traditional almanac notes and auspicious-hour tables, plus Gregorian/lunar conversion
World Time Difference icon
World Time Difference
Live side-by-side clocks for any two cities with automatic daylight-saving handling, cross-time-zone conversion and a world-city clock wall
remove.bg icon
remove.bg
AI background removal in one click
Squoosh icon
Squoosh
Open-source image compression by Google: compare WebP, AVIF and MozJPEG side by side with a live quality slider — drag a photo in, everything runs locally
Convertio icon
Convertio
Universal file format conversion
ChartLiao icon
ChartLiao
QR code generator & decoder
Temp Mail icon
Temp Mail
Disposable inbox for verification codes
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Developer Resources

Appinn icon
Appinn
Curated reviews of free Windows, Android and macOS utilities — a reliable place to hunt for lab and research software
Regex Lab icon
Regex Lab
Online regex tester like RegExr: real-time highlighted matches, group details, $1 replacement preview, syntax cheat sheet and step-by-step explanation
Unit Converter icon
Unit Converter
14 categories and 212 units — length, area, volume, mass, time, speed, temperature, pressure, power, energy, data (GB vs GiB), fuel economy, angle and number bases; converts as you type, factors taken from their definitions
Loan Calculator icon
Loan Calculator
Four loan tools on one page: a loan calculator (equal-installment / equal-principal payments with a month-by-month schedule you can export to CSV), a mortgage calculator (commercial / housing-fund / combined loans), a mortgage prepayment estimator (pay off in full, shorten the term or lower the payment, see interest saved), and an installment-fee calculator with the real APR by IRR — all computed locally in your browser
Income Tax & Social Insurance Calculator icon
Income Tax & Social Insurance Calculator
China's individual income tax by the cumulative-withholding method (this-period and annual tax, take-home pay, average rate, seven-bracket rate table, special additional deductions) plus a five-insurances-one-fund breakdown of employee/employer contributions, net pay before tax and total employer cost — all computed locally in your browser
JSON.cn icon
JSON.cn
JSON formatter & validator
Can I use icon
Can I use
Browser compatibility tables
Excalidraw icon
Excalidraw
Hand-drawn style whiteboard
Shields.io icon
Shields.io
Badges for open-source projects
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Everyday Services

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